Easier Way? Creating A Fold in Blender
You should use an armature, and create one bone by fold, like this (the central one being the parent of all the bones):

Give your bones names, parent the object to the armature with With Empty Groups option, select the vertices of a fold in Edit mode and in the Properties panel &gt; Object Data &gt; Vertex Groups, assign these vertices to the vertex group they are supposed to be part of (the vertex group that has the name of the bone that is supposed to control these vertices).
You can also give some Limit Rotation constraints to each bone so that they only rotate on the right axis.